On Tue, 30 Aug 2005 15:25:22 -0700 Junio C Hamano wrote: > Christian Meder <[EMAIL PROTECTED]> writes: > > > Is alternates unthinkable with URLs (e.g. remote alternates). > > In order to read an object data, the low level core GIT layer > does open()/mmap() of a file on the locally mounted filesystem. > It also does opendir()/readdir()/closedir() to find what's > available. > > If you can arrange to automount via luserfs (or whatever; we do > not care much about particular implementation) so that it can do > these filesystem operations, git will happily use it. > > Even in that case, the alternate you would tell git should look > like a local filesystem path --- your automounting from remote > specified with URL for such a path would happen outside GIT.
All this means that currently there is no clean way to publish a partial GIT repository, unless you place it at the same server where the base repository is located (and even in that case needing to use something like "echo /pub/scm/linux/kernel/git/torvalds/linux-2.6/objects > objects/info/alternates" looks like a horrible hack). What if we create a mapping layer from URLs to local mirrors of corresponding repositories? Store this mapping, e.g., in ~/.git-core/mirrors, then if git reads an URL instead of an absolute local path from objects/info/alternates, it will consult that file and either use the specified local mirror, or complain that a local copy of the base repository is not available. The partial repository will then contain no system-specific paths and could be published without problems.
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